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Extract a method. No functional change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-02 23:05:16 +00:00
parent e89a05337a
commit e2dc0c978e
2 changed files with 28 additions and 27 deletions
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51
lib/CodeGen/SplitKit.cpp
View File

@ -646,6 +646,29 @@ void SplitEditor::closeIntv() {
OpenIdx = 0;
}
void SplitEditor::extendPHIKillRanges() {
// Extend live ranges to be live-out for successor PHI values.
for (LiveInterval::const_vni_iterator I = Edit.getParent().vni_begin(),
E = Edit.getParent().vni_end(); I != E; ++I) {
const VNInfo *PHIVNI = *I;
if (PHIVNI->isUnused() || !PHIVNI->isPHIDef())
continue;
unsigned RegIdx = RegAssign.lookup(PHIVNI->def);
MachineBasicBlock *MBB = LIS.getMBBFromIndex(PHIVNI->def);
for (MachineBasicBlock::pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI) {
SlotIndex End = LIS.getMBBEndIdx(*PI).getPrevSlot();
// The predecessor may not have a live-out value. That is OK, like an
// undef PHI operand.
if (Edit.getParent().liveAt(End)) {
assert(RegAssign.lookup(End) == RegIdx &&
"Different register assignment in phi predecessor");
extendRange(RegIdx, End);
}
}
}
}
/// rewriteAssigned - Rewrite all uses of Edit.getReg().
void SplitEditor::rewriteAssigned() {
for (MachineRegisterInfo::reg_iterator RI = MRI.reg_begin(Edit.getReg()),
@ -737,34 +760,8 @@ void SplitEditor::finish() {
// All other values have simple liveness that can be computed from RegAssign
// and the parent live interval.
// Extend live ranges to be live-out for successor PHI values.
for (LiveInterval::const_vni_iterator I = Edit.getParent().vni_begin(),
E = Edit.getParent().vni_end(); I != E; ++I) {
const VNInfo *PHIVNI = *I;
if (PHIVNI->isUnused() || !PHIVNI->isPHIDef())
continue;
unsigned RegIdx = RegAssign.lookup(PHIVNI->def);
MachineBasicBlock *MBB = LIS.getMBBFromIndex(PHIVNI->def);
DEBUG(dbgs() << " map phi in BB#" << MBB->getNumber() << '@' << PHIVNI->def
<< " -> " << RegIdx << '\n');
for (MachineBasicBlock::pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI) {
SlotIndex End = LIS.getMBBEndIdx(*PI).getPrevSlot();
DEBUG(dbgs() << " pred BB#" << (*PI)->getNumber() << '@' << End);
// The predecessor may not have a live-out value. That is OK, like an
// undef PHI operand.
if (Edit.getParent().liveAt(End)) {
DEBUG(dbgs() << " has parent live out\n");
assert(RegAssign.lookup(End) == RegIdx &&
"Different register assignment in phi predecessor");
extendRange(RegIdx, End);
} else
DEBUG(dbgs() << " is not live-out\n");
}
DEBUG(dbgs() << " " << *Edit.get(RegIdx) << '\n');
}
// Rewrite instructions.
extendPHIKillRanges();
rewriteAssigned();
// FIXME: Delete defs that were rematted everywhere.

4
lib/CodeGen/SplitKit.h
View File

@ -246,6 +246,10 @@ class SplitEditor {
SlotIndex Idx,
const MachineBasicBlock *IdxMBB);
/// extendPHIKillRanges - Extend the ranges of all values killed by original
/// parent PHIDefs.
void extendPHIKillRanges();
/// rewriteAssigned - Rewrite all uses of Edit.getReg() to assigned registers.
void rewriteAssigned();